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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b62ebb00edaaca20bee2e13c9417ecc04936584921c5c9a3cf549fa8aaa3b9a' 
  AND token = 'x3DGTaF09KU9eIK0KylRwKwhZJ2yApCMYjZxslRQNOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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