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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3359b8fb198a084d6e8c5b0a67035561bc552397237b2d75851842d4776019b' 
  AND token = '/MD6A/Yfbp5WfijqfbmMul70H1M4WeLSRgUG9yuzP/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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