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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3529b0c696cd7d229a59c3363d29b62d6a23696285525227c93e6ffe940d6bd0' 
  AND token = 'lVoSHcZ+DtKtVxXacmzoVGpQA+Kr09azXR+eU8sf15Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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