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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c5df6cd2c4b5f56ee618550e435681891dc85617f076b8f3dcc6be6be4892d' 
  AND token = '58NM6lV9O0/yAecPxmi6M5VWtWo54LNByIV0V/tofII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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