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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be763b4b8879fe120eae43975adfa36207fcdff69b4f9fbf1ba438e2652efe85' 
  AND token = '7wad39ugHcyejRkkwOW6Tjr3tkRnMAQrQPQbiXr+ldk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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