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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b5fa739bc4a55d9940fdf3131b146d9f4f3906c961cddcf0072f6e191d8846' 
  AND token = 'eITSWlmYhDdLLt3ySyxQYHmSCAUURaqehdTq60sUYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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