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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eaee6c72391428568c3b698ac659031f09af5fbc55bcb3d539fced9f9b811b' 
  AND token = 'vjWf1n4jyG1se0r+HyOV8waBCZAcEAuPa9NMwd/8/sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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