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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adeb1ad9479e5b39b257b62c325bce2e247380cdbfa9a497127ade1a81fc90b' 
  AND token = 'Wn8Q0JwIH3ELzI216pa0/JVXYeTLwQ30WANIPiZVXJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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