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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068ad9f463ed5a92a5814aee48e89630d57472adef1856997c2ce7a0dc290fe9' 
  AND token = 'AcW62H2rmPqZwwB7TsJxhr1/z4UOF6UtFE05UclQm4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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