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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befc5b21446b82c1fa944015c5fdf2482490649e98182ff34b390a1c8220afc9' 
  AND token = '1MZM6w7xuuHqio6MEbEEHwfmVSEROaL/ozzpKmimeoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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