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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0638ab185332e35b45156290a6e426039a9dc6ad1be787afbe03cd23d12d87b7' 
  AND token = 'KcxEJ2JcS4BaGMEt2a3Lk6S6tqC68peXgGfDzc+kJ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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