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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf3891e19ee86aab3c2a257b99a10d96bcdc6ad95cc83fc1ef3cc51c08490ed' 
  AND token = '5daGQS4J84wOuY5IjPe/akhFx94NNZ/Fb/xrLu+Ords=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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