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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2591d3ad768ddb00b7dcfbda4cd50c5cdcd21cc26c9716ee1c9acebfb03875' 
  AND token = 'c5llgHwfXnq3zbMFKMwaG8GJS0m1P5gTEM9WQYTm2oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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