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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63031776a1ce703c948c8b6c3fa5d40bd5051ac52f1225942c215bf43c94c46' 
  AND token = 'Qc7FVBx9hzlxyqMsKNf3wX2Mdzep7l2+rGaeiO9sE4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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