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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e815d80947fb14e0368d6d64fefb0da95b8a392e3c2a46bb2ba92b3ec3b12a97' 
  AND token = 'mE4YEE0N9HIt/CCr8vryML8shLHtyYFLGGM8Hci978g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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