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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58014e418afbea3a8effc119598b6eb95b85a0fa730c6a0e14d03024f036d85' 
  AND token = '4J5mIOtiq4ro+w6uUlwyvpwB8mHMRuQxPr4mkc2yyWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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