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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaa9d58b5ebd8934b5da9a34c379a246bddc55ef7cfeff88f0ccb8d23a6952b' 
  AND token = 'bVK/NqndjdItOW5EBnVBXttt666f/3ea3q/H5uB5Eow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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