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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224d2f5cda6d49c2b76b395929ad5c9a038d8b16af744d1cde387bfbe748be5e' 
  AND token = '/s4CrVN8g8p8AkAJUR1Wl4O/T5z/Wn5IMnnsVB+u7Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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