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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6197a1855df89754acb8c876a61fb03bf330aa3cb8623a3cd740b6b58e89b9' 
  AND token = 'QHMkiL/munMl0DTIOlT4HOw3Ohfew3SAazaxZYloGCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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