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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2836bbee669505cc0ab68b08d5a40183e2776deecf4c2fb9ace944c0e85ecc' 
  AND token = 'DkuupIRs/Nn4XYusQviY3rWK7Iz03BVQ34FsT6yRkZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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