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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6ed61c8af09715eaf92a8383033559be4355991687428a790f79d12a0b903b' 
  AND token = 'HlpHqVwsz50QWEL7QRb3fQhKTvxAfNlitSLEQ7x0T00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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