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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1c97cdd27e04f8ff335d132cea55a0fd877d8d31c7dd0e8ba4c2d6d7e03aac' 
  AND token = 's0sCZANQPxtUWE8g7S/D6Y2xkNqp4E7SPZFTgFpBgGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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