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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbfd0f0209d9045eb3e502e58d80570f849dbf2bcc238de6c1bcaa228046519' 
  AND token = 'leV73A2zEne8Uouwbx9UZa2vb8FfjD5+tiKZuzjQkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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