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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eeb09b5b24c6d016dd2384a9a0ebb99cbff67e5a8d70b4b91c82bb47492974' 
  AND token = 'ynadIzbhNeZmaPLBu1GNgTPgBNQmL0Jxo8JYMv8wFgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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