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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb76349dc97e8ac0364b25a318912a1db6a4bf09766714ce4f88b557477acf4a' 
  AND token = 'QYrFItkESKn7OGv1Eh24VaGBW2kRD08tIQ0Pq+qa+TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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