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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6d1b92a8a5ff8df6cb0d727ac2b5d6b4cf92f6d0fd6d65bd287852b7c0a2af' 
  AND token = 'DRgvCMnesaDYbw/8iAsBSGjFOZhHiowuQmAFwWmbw4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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