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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1372feb5f0ba944a116ebaca71709fe5494f003eee375ef6667965a7a64ca2e1' 
  AND token = '0+52m9HV6j8c+Fu8AQIN6EsBWh8lzWpnOW7+6ga1HAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}