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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87360be8187f8f9d1ec0d6b6b38859866b62c9cddb4951b9369e3d69ec850b99' 
  AND token = '9V5KKgX4LNkvfuvuCwW3NHxC3VeMXSEqnwMLXhQO/rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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