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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a075ce9fb2200afab388f631a8bf795bd7c408e8c78d0e11d9eeeb6ae520fc' 
  AND token = 'irwfHH7MIkpkleZweIDsoM3vovE+JjrtiFM1GspGFaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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