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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4947a94dbafeb4e2e51b2d85335ecdb157f23fe1ee554af0c5e1e382aecf8050' 
  AND token = 'OWmn4BTepxOjb9NyAOfQyjcBFz28KsPyyuxEpVzH3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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