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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a42d17e242a617ab88e4f4734d2a36d5fb1a962396add66732afbd0c076aa08' 
  AND token = 'hf+HYOras9sRbLQbSJyTheOysb/z6AZrwV/+Qrezx2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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