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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03af69330f413235372f62a9633fb082aa6fed5bb5181240c52c4392042bca59' 
  AND token = 'R9ra+OJKyJQoHiLzA5Y3YbmZn1+ZIsYKBMr8yOZnCwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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