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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73cdf5799721aa34ad822cfcb3a4f6cdbc994af02d2c299870e68256173db45' 
  AND token = 'O83xS1xCpUQjf6LD/nFHsqeYSqN0cbTu8lZFCDFobH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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