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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0d1f1dc3120eeb3f24e369c31a1074f5d5c2bddcacc3985860a621ae0218c9' 
  AND token = 'n3J8qtjxnjz3XaqJtieDUoKa9UStKZ+Kfo/W9PjaHew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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