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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70c4bd0eedb55895700201e9f2984c30cf149d158881df1498d6b283b4b7c5d' 
  AND token = 'Q6Wm2v+hHXKmRNa/mxYSmx6WG0ifLinciqk2dS/B2SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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