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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874e31d0c4c2f09455ec7ddc411c1b69510ae988f47679ae576fc17df5819c05' 
  AND token = 'Ur5kJ7ZDbR7RRs4CUfdOGDXBcXkSq8iyEgcXWPJTYNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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