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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115d29f99f4af1d18c2582dbe1c76791bfe40051a57a7c1131256d208f5c92b5' 
  AND token = 'qr6O7oalkeyEWqZN9kZzh0eyfDNWks9+YCUeyDZlVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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