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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b3f967164638b144eb19f022b5a9dd28dd58dc5c738ede313616e9d80d93d6' 
  AND token = '//1ydRK7tIb5Ox4jUexEyDMbSx1MGj0HmfbmaP1ux+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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