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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326db83424cf2e9ef8ae42c134888aafcfbf9b43eaddf367f22299cf0eb6239' 
  AND token = 'Gi7Ys77JzGsbXsQoroBj1o/sWBIiHVGL+lc8BnXnNQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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