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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe3436fb009ed405497ebc6ebd32b6cb523e8abbbe8745a414246fe54ab23b7' 
  AND token = '2nfBHzEqBxsvlZuxHvLEYLoSf2DzMOItZL2XiFE5cJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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