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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b00994232ef0e1b5c11be79139c2996e3e3dd82726ea317d38606375f39981' 
  AND token = 'Zq5UuekRcNWVOUomouF6kZQZ++naFQsz0C0KYWmw4zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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