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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddae468d5d8af33516b0ccda5ed8dd0ffc0c42d6b03af4e2c7729d5be92229a6' 
  AND token = 'NTRpLjbztPUPF6mraT4g6vv6Gm/o+9b9yaH2IJXvdI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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