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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ba2d2235d782975d56af2e93e81c6661c8b83a42cf31a73c5c15c680024e18' 
  AND token = 'dv+d1b1/ZSSBJimFGDVdP+R+BOeUI75TGWh7Pgn5TFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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