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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f604e8d2f0496eaaa5e0e6489bde5cf324920ab7e0f61dc2ab479d1cb62327d' 
  AND token = 'Fk9nV8njdpR02C6GdjIXntWuBpqlqVJIQidXtJECsB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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