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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9449f5aff323e7382821561417625242fc2d789633c48e109c9935c6843caea4' 
  AND token = '/pnX8h9zcX+eq6dRXRYNN5+Hyl205cejP4zoTFdfO0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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