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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0a8f5b1b7e8c9d500b1ee5cc61d6ec9f0369d420f399887bf8d6bf5ca18f8e' 
  AND token = '0P3BstTbcJKPdmGVhFcNlwFmTGz73+w3jjYkl1HNrCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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