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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a41fa8031fef419c29211a5d255c88537cf896a3d5d670e6f715f558ea62237' 
  AND token = 'pEaod2e6CrM7q/VNS4b9ourUdbFO0Bar3NYpivcuQ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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